Insulated Case Breakers

Insulated Case Circuit Breakers: Supply, Testing, Repair, and Retrofit Solutions

Insulated case circuit breakers (ICCBs) are commonly used in switchboards and low voltage distribution systems where higher interrupting capacity and reliability are required. When these breakers fail or need to be replaced, sourcing the correct unit and ensuring system compatibility can quickly become a challenge - especially in existing installations.

Bay Power supports contractors, maintenance teams, and facilities with complete lifecycle solutions for insulated case circuit breakers, including sourcing, testing, repair, and modernization. We are an authorized ABB distributor. We can also help with preventative maintenance schedules to help prevent future failure risk.

Tripped Breaker? Need it recertified? Call Us! 

When a breaker trips, the immediate priority is getting the system running again. However, simply resetting a breaker without testing it can create additional risk. Industry standards suggest the breaker needs to be tested to ensure it's still suitable for service. Bay Power offers circuit breaker testing and diagnostic services that help determine whether the breaker itself failed or if another issue caused the trip event. We can recertify the breaker to ensure it's safe to put back into service. With the ability to test molded case, insulated case, and larger power breakers, contractors can verify equipment performance before putting systems back into service. This capability gives contractors confidence that the equipment they reinstall is operating as intended.

If replacement is necessary, we will provide options and also help with preventative maintenance schedules to help prevent future failure risk. 

What We Do

Bay Power provides full-service support for insulated case circuit breakers across the most widely used platforms in the field:

• Supply replacement insulated case circuit breakers
• Test and evaluate existing breakers
• Repair and refurbish units
• Source obsolete and hard-to-find models
• Support retrofit and upgrade projects
• Provide application support for existing systems

This allows us to function as both a supplier and a technical resource—not just a distributor.

Get more information on GE AKR, AKD, and EntelliGuard upgrades and retrofits >>

Supporting Existing Systems and Legacy Equipment

Most insulated case circuit breakers are installed in existing switchboards and distribution equipment. In many cases, these systems are no longer fully supported by the original manufacturer, making replacement and repair more complex.

Bay Power specializes in supporting:

• Legacy switchboard installations
• Obsolete or discontinued breaker lines
• Systems requiring quick turnaround to restore power
• Facilities operating mixed manufacturer equipment

Our focus is on helping customers maintain and extend the life of their existing infrastructure while providing clear upgrade paths when needed.

Large Inventory for Faster Turnaround

Bay Power maintains a deep inventory of insulated case circuit breakers and related components to support urgent replacement and repair needs.

Our inventory includes:

• Used and obsolete breakers
• Replacement parts and components
• Hard-to-find legacy units

This allows us to respond quickly when failures occur, reducing downtime and avoiding extended factory lead times.

In-House Testing and Repair Capabilities

We don’t rely on third parties for testing and repair. All work is performed in-house by experienced technicians who work directly with insulated case circuit breakers every day.

Our capabilities include:

• Diagnostic testing to verify breaker condition
• Repair and refurbishment services
• Evaluation of system-related issues vs. breaker failure
• Support for preventative maintenance planning

Because we test and repair these breakers regularly, we understand how they perform and how to identify issues quickly.

Multi-Brand Support

Bay Power works across all major manufacturers of insulated case circuit breakers. This is critical for facilities operating equipment from multiple brands or older product lines that are no longer widely supported.

Instead of being limited to a single manufacturer, we provide:

• Cross-brand support and sourcing
• Matching of existing breakers to available replacements
• Guidance on compatibility within existing systems

This flexibility allows us to provide practical solutions based on what is actually installed in the field.

Retrofit and Upgrade Solutions

When insulated case circuit breakers need to be replaced, it is often the right time to evaluate system upgrades.

Bay Power supports:

• Trip unit and protection upgrades
• Arc flash reduction and maintenance mode solutions
• Retrofit kits for modernizing existing switchboards
• Replacement of obsolete breakers with current platforms

These upgrades improve system safety, reliability, and compliance with current standards.

Common ICCB We Regularly Test/Replace/Stock:

• ABB / GE (legacy): Tmax T7, T8, and newer Tmax XT series (XT7, XT8)
• Schneider Electric / Square D: Masterpact NT and NW
• Siemens: WL series
• Eaton / Cutler-Hammer: Magnum DS

We regularly help customers replace older GE insulated case breakers with ABB Tmax XT upgrades, including retrofit solutions for existing switchgear. From trip units and rating plugs to full breaker replacements, we help identify the correct configuration and deliver quickly.

ABB Authorized Distributor with Factory Support

As an authorized ABB distributor, Bay Power provides access to factory-backed solutions for insulated case circuit breakers and system upgrades.

This includes:

• New ABB insulated case breakers
• OEM-supported replacement and upgrade paths
• Retrofit solutions for legacy equipment

This gives customers a reliable path forward when transitioning from obsolete systems to modern equipment.

Why Bay Power

Bay Power combines inventory, technical expertise, and service capabilities into a single resource:

• Large inventory of insulated case circuit breakers
• In-house testing and repair services
• Support for obsolete and legacy equipment
• Multi-brand knowledge across major manufacturers
• Factory-backed ABB solutions

We work directly with these breakers every day, which allows us to provide faster, more accurate solutions than standard distribution channels.

Speak with a Circuit Breaker Specialist

Insulated case circuit breakers are not always straightforward replacements. Proper identification, system compatibility, and application requirements all need to be considered.

If you need help sourcing, repairing, or upgrading an insulated case circuit breaker, contact our team to speak with a specialist who can guide you to the right solution.